MERCEDES-BENZ SLC ROADSTER 2020 Owner's Manual

Radio
typeapprov alfor the tire pres -
sure monitor Co
untry Radio
typeapprov alnumb er USA FCC
ID:MRXMW 2433A
FCC ICID:MR XGG4 Thisd evice
comp lies with part15 ofthe
FCC rules and with license
exem ptRSS stand ardsofIndu s-
try Canad a.Ope rationissu bject
to the followi ng condi tions.(1)
Thi sd evice may notcause
ha rmfu linter ference, and(2)
Thi sd evice mus tacce ptany
inter ference rece ived,incl uding
inter ference that may cause
und esired operation. Lepre sent
ap parei lest confor med'indu s-
trie Canad aapplica bles aux
ap parei lsrad ioexem ptsde
li cence. L'exploitati onest
au thori seeauxd euxc ondi tions
su iva ntes. (1)L'appare ilne doit
pa sp rodu ire debro uillag e, et
(2) L'autisatue rdel'app are il
doi tacce pter toutbrouillag e
rad ioelectri ques ubi,meme sile
bro uillag ee stsuscep tibled'e n
comp romettrelefoncti onne-
ment. WARNING :Chang es or
mod ificati ons notexpr essly
ap pro ved bythe party respons i-
bl ef or comp liance couldvoi d
the user' sa uthori tyto ope rate
the equipment. Theterm "IC:"
bef ore theradiocerti fication
numb eronly signifi esCanad a
techni calspe cificati ons were
met.
FCC ID:MR XMC34MA4 This
dev icecomp lies with part15 of
the FCC rules and with license
exem ptRSS stand ardsofIndu s-
try Canad a.Ope rationissu bject
to the followi ng condi tions.(1)
Thi sd evice may notcause
ha rmfu linter ference, and(2)
Thi sd evice mus tacce ptany
inter ference rece ived,incl uding
inter ference that may cause
und esired operation. Lepre sent
ap parei lest confor med'indu s-
trie Canad aapplica bles aux
ap parei lsrad ioexem ptsde Co
untry Radio
typeapprov alnumb er li
cence. L'exploitati onest
au thori seeauxd euxc ondi tions
su iva ntes. (1)L'appare ilne doit
pa sp rodu ire debro uillag e, et
(2) L'autisatue rdel'app are il
doi tacce pter toutbrouillag e
rad ioelectri ques ubi,meme sile
bro uillag ee stsuscep tibled'e n
comp romettrelefoncti onne-
ment. WARNING :Chang es or
mod ificati ons notexpr essly
ap pro ved bythe party respons i-
bl ef or comp liance couldvoi d
the user' sa uthori tyto ope rate
the equipment. Theterm "IC:"
bef ore theradiocerti fication
numb eronly signifi esCanad a
techni calspe cificati ons were
met. Ca
nad a IC:
2546A-MW 2433A
IC:2 546A-G G4Thisd evice com-
pl iesw ithp art1 5o fthe FCC
rul es and with license exempt
RSS stand ardsofIndu stry Can-
ad a.Ope rationissu bject tothe
fol lowi ng condi tions.(1) Thi s
dev icemay notcauseharmfu l
inter ference, and(2)Thisd evice
mus tacce ptany inter ference
rece ived,incl uding inter ference
that may causeund esired oper-
ati on. Lepre sent apparei lest
confor med'indu strieC anad a
ap plica bles auxa ppareils rad io
exem ptsdelicence. L'exploita-
tion estauthori seeauxd eux
condi tions suiva ntes. (1)L'ap-
pa rei lned oitp as pro duire de
bro uillag e, et (2) L'autisatue rde
l'a pp are ildoi tacce pter tout
bro uillag er adioelectri ques ubi,
meme sile bro uillag ee stsus-
cep tibled'e ncomp rome ttrele
foncti onnem ent.WAR NING :
Ch ang esormod ificati ons not
expr esslyap pro ved bythe party
res pons ible for comp liance
cou ldvoi dthe user' sa uthori ty
to ope rate theequipment. The
term "IC:"bef ore theradiocer-
tifi cati onnumb eronly signifi es
Ca nad atechni calspe cificati ons
we remet. Tire
press ure
279Whe elsa nd tires Z

Count
ry Ra
dio type approval number IC:
2546A-MC34 MA4 Load
ingthev ehicle Inst
ruction labels fortires and loads G
WAR
NING
Ove rloade dtires can over heat ,causi nga
blowout .Overloade dtires can also impair
th es teerin gand driv ingchar acteris ticsa nd
lead tobrak efailur e.Ther eisar iskofacc i-
den t.
Obse rvethel oad rating ofthet ires. The load
rat ing must beatleast halfoftheG AWR of
your vehicle.Never over load thet ires by
exc eedin gthe max imum load.
Two instruct ion labels onyour vehicle show
th em aximum possibleload.
(1) TheTire andLoadin gInfor mat ionplacar d
is on theB -pillar onthed river' ss ide. The
Tire andLoadin gInfor mat ionplacar d
shows them aximum permissiblenum ber
of occ upant sand them aximum permissi-
ble vehicle load. Italso contain sdetails of
th et ires izes and correspon ding pressures
for tires moun tedatthef actory.
(2) Thevehicle iden tificat ion plat eiso nthe
B- pillar onthed river' ss ide. Thevehicle
iden tificat ion plat einform syou ofthe
gro ssveh icle weight rating .Iti sm ade up
of thev ehicle weight ,allveh icle occu-
pant s,thef uel and thec argo. You canalso
fin dinform ationabout them aximum gross
axle weight rating onthef ront and rear
axle.
The maximum grossaxle weight rating is
th em aximum weight that can becar ried
by one axle (front orrear axle) .Never
exc eed them aximum loadorthem axi-
mum grossaxle weight rating forthef ront
or rear axle. 0043
B-pillar ,driver' ss ide Ma
xim um permis sible grossvehicle
weight ratin g X
Spe cificat ion formax imum grossveh icle
weight 0043islist ed intheT ire and Loadin g
In for mat ionplacar d:"The combinedweight
of occ upant sand car goshould never
exc eed XXX kilogram sorXXX lbs. "
The grossweight ofall veh icle occupant s,load
and luggage mustnotexceed thes pec ified
value.
i The
spec ificatio nsshown ontheT ire and
Loadin gInfor mat ionplacar dint he illust ra-
tio na reexam ples.Themaximum permissi-
ble grossveh icle weight rating isveh icle-
spec ificand may differfro mt hatint he illus-
tr atio n.You canfindt he valid maximum per-
miss iblegrossveh icle weight rating foryour
veh icle ontheT ire and Loadin gInfor mat ion
placar d. 280
Load
ingthev ehicleWh eels andtires

Numbe
rofseats Ma
xim um num bero fseats 0043 indicates the
ma xim um num bero foccu pants allo we dto
tra vel inthe vehicle. Thisinf orm ation can be
fou ndonthe Tire and Loading Info rma tion
pl aca rd.
i Th
es pecificat ions sho wnonthe Tire and
Loa ding Info rma tionp laca rd inthe illu stra -
tio na reexa mpl es.T he num bero fseats is
veh icle-s pecificand candiffe rfromt he
de tai lssho wn. Then um bero fseats inyour
veh iclec an be fou ndonthe Tire and Load-
ing Info rma tionp laca rd. De
termi ning the correc tloa dl im it
Ste p-by -stepinstruc tions Th
ef ollowi ng ste pshave been devel oped as
req uired ofallm anufact urers und erTitle 49,
Co de ofU.S. FederalRegulat ions, Part575
pu rsu ant tothe "Nati ona lTraffica nd Mo tor
Ve hicle Safety Act of1966 ".
X Ste p1:Loc ate the stateme nt"The com -
bi ned weight ofoccu pants and cargosho uld
neve rexce edXXX kgorXXX lbs." onyour
veh icle’sT irea nd Loa ding Info rma tionp lac-
ar d.
X Ste p2:Dete rminethe com bined weight of
the driver and passe nge rstha twillb er iding
in your veh icle.
X Ste p3:Sub tractthe com bined weight of
the driver and passe nge rsfro mX XXkilo-
gra ms orXXX lbs.
X Ste p4:Th er esulting figu re equalsthe avail-
ab leam ount ofcar goand lugg ageloa d
cap acity. For exampl e,ifthe "XXX" amount
eq uals1400 lbsa nd the rewillbe five 150-l b
pa sse nge rsinyour veh icle, the amount of av
ailabl ec argo and lugg ageloa dc apaci tyis
650 lbs( 14 00 -750 (5x1 50) =650lbs).
X Ste p5:Dete rminethe com bined weight of
lu gg agea nd car gobeing load ed on the vehi-
cle .Tha tw eigh tm aynot safel ye xce edthe
av ailabl ec argo and lugg ageloa dc apaci ty
cal culated inste p4 . Ex
ampl e:ste ps1to3
Th ef ollowi ng tab lesho wsexa mpl eson howt o
cal culate tota land car goload cap acitiesw ith
va rying seati ng conf igur ati ons and num bera nd
si ze ofoccu pants. Thef ollowi ng exa mpl esuse
al oa dlim itof 1500 lbs( 68 0k g).Thi sisf or
il lus trati onpurpo seso nly. Ma kesure you
ar eu sing the actu alload limi tfor your veh icle
sta ted onyour veh icle'sT irea nd Loa ding Info r-
ma tionp laca rd (Y page 280 ).
Th eg reate rthe com bined weight ofthe occu -
pa nts, thelowe rthe ma xim um lugg ageloa d.
Ste p1 Ex
ampl e1 Ex
ampl e2 Co
mbi nedm ax-
imu mw eigh t
of occu pant s
and cargo
(da tafro mt he
Tire andLoad-
in gI nfor ma-
tio np laca rd) 1500
lbs
(68 0kg) 1500
lbs
(68 0kg) Lo
adi ng the vehicle
281Whe elsa nd tire s Z

Step
2 Example
1 Example
2 Num
berofpeo-
ple inthe vehi-
cle (driver and
occupants) 1 2
Weight
ofthe
occupants Occu-
pant 1:
175 lbs
(80 kg) Occu-
pant 1:
175 lbs
(80 kg)
Occu-
pant 2:
195 lbs
(88 kg) Gross
weight
of all occu-
pants 175
lbs
(80 kg) 370
lbs
(168 kg) Step
3 Example
1 Example
2 Permissible
load (maxi-
mum gross
vehicle weight
rat ing from
the Tire and
Loading Infor-
mat ionplac-
ard minus the
gross weight
of all occu-
pants) 1500
lbs
(680 kg)00F8
175 lbs
(80 kg)=
1325 lbs
(600 kg) 1500
lbs
(680 kg)00F8
370 lbs
(168 kg)=
1130 lbs
(512 kg) Vehicle
identification plate
Even ifyou have calculated thetotal cargo
carefully, youshould stillmake surethatthe
gross vehicle weightratingandthegross axle
weight ratingarenot exceeded. Detailscanbe
found onthe vehicle identification plateonthe
B-pillar onthe driver's sideofthe vehicle
(Y page 280).
Permissible grossvehicle weight: thegross
weight ofthe vehicle, allpassengers andthe
load must notexceed thepermissible gross
vehicle weight. Gross
AxleWeight Rating (GAWR): themaxi-
mum permissible weightthatcanbecarried by
one axle (front orrear axle).
To ensure thatyour vehicle doesnotexceed
the maximum permissible values(grossvehi-
cle weight andmaximum grossaxleweight rat-
ing), have yourloaded vehicle (including driver,
occupants andtheload) weighed onasuitable
vehicle weighbridge. All
about wheelsand tires Uniform
TireQuality GradingStand -
ard s
Overview ofTire Quality Grading
Stand ards Uniform
TireQuality Grading Standards are
U.S. governmen tspecifications. Theirpurpose
is to provide driverswithuniform reliableinfor-
mation ontire performance data.Tiremanu-
facturers havetograde tiresusing threeper-
formanc efactors: 0043tread weargrade, 0044
tract iongrade and0087temperature grade.
These regulations donot apply toCanada.
Nevertheless, alltires soldinNorth America
are provided withthecorrespondin gquality
grading markings onthe sidewal lofthe tire.
Quality gradescanbefound, whereapplicab le,
on the tire sidewal lbetween treadshoulder
and maximum sectionwidth.
Example:
R Tread weargrade: 200
R Tra ction grade: AA
R Temper aturegrade: A
All passenger cartires must confor mtothe
statutory safetyrequirements inaddition to
these grades. 282
All
about wheelsand tiresWheels andtires

i
The
actual values fortires arevehicle-spe-
cific andmay deviate fromthevalues inthe
illustration.
Tr eadwear The
treadwear gradeisac omparative rating
based onthe wear rateofthe tire when tested
under controlled conditionsonaspecified U.S.
governm entcourse. Forexample, atire graded
150 would wearoneandone-half timesaswell
on the governm enttest track asatire graded
100.
The relative performan ceoftires depends
upon theactual conditionsoftheir use,how-
ever, andmay depart significant lyfrom the
norm duetovariations indriving habits, ser-
vice practic esand differenc esinroad charac-
terist icsand climate.
Tr action G
WARNIN
G
The tract iongrade assigned tothis tireis
based onstraight -aheadbraking traction
test s,and does notinclude acceleration ,
corn ering, hydroplaning, orpeak traction
charact eristics.
! Avoid
wheelspin. Thiscanlead todamage
to the drive train.
The tract iongrades –from highest tolowest –
are AA, A,Ba ndC.Those grades represent the
tire's ability tostop onwet pavement asmeas-
ured under controlled conditionsonspecified
governm enttest surfaces ofasphalt andcon-
cret e.At ire marked Cmayhave poortraction
performan ce.
The safe speed onaw et,snow covered oricy
road isalway slower thanondry road surfa-
ces.
You should payspecial attentiontoroad con-
ditions whentemperat uresarearound freezing
point.
Mercedes- Benzrecomm endsaminimum tread
depth of00CF in(4 mm) onallfour winter tires.
Observe thelegally required minimum tire
tread depth (Ypage 269). Winter tirescan
reduce thebraking distance onsnow-c overed
surfaces incomparison withsummer tires.The
braking distance isstill much further thanon surfaces
thatarenot icyorcovered withsnow.
Take appropriate carewhen driving.
Temp erature G
WARNIN
G
The temperat uregrade forthis tireisestab-
lished foratire that isproperly inflatedand
not overloaded. Excessive speed, underinfla-
tion, orexcessiv eloading, eitherseparately
or incombinat ion,cancause excessiv eheat
build-up andpossible tirefailure.
The temperat uregrades areA(the highest), B,
and C,represent ingthe tire's resistanc etot he
generation ofheat anditsability todissipate
heat when testedunder controlled conditions
on aspecified indoorlaboratory testwheel.
Sustained hightemperat urecan cause the
material ofthe tire todegenerate andreduce
tire life, and excessiv etemperat urecan lead to
sudden tirefailure. Thegrade Ccorrespon ds
to alevel ofperforman cewhich allpassenger
car tires must meet under theFederal Motor
Vehicle SafetyStandard No.109. Grades B
and Arepresent higherlevelsofperforman ce
on the laboratory testwheel thantheminimum
required bylaw. All
about wheelsand tires
283Wheels andtires Z

Tire
labelin g
Ov erv iew 0043
UniformT ireQ ualityG radin gS tand ard
(Y page 287 )
0044 DOT, Tire Ide ntifi cationNumbe r
(Y page 286)
0087 Maxim um tire load (Ypage 286 )
0085 Maxim um tire pressu re(Y page 274 )
0083 Manuf actu rer
0084 Tire ma teri al(Y page 287 )
006B Tire size designa tion,load -be aring capacity
and spee dr ating (Ypage 284 )
006C Loadind ex (Y page 286 )
006D Tire nam e
The markin gsdescri beda bove areo nthe tire
in ad ditio nt ot he tire nam e(sales designa tion)
and themanuf actu rer'snam e.
i Ti
re data isveh icle-s pecificand maydevi-
ate fromt hedata inthe exampl e.
Tire size des ignati on,loa d-b eari ng
ca pac ityand speedratin g G
WA
RNING
Excee ding the stated tire load -be aring capa-
city and theappro ved maxim um spee d
cou ldlead totire dama georthe tire burst-
ing .The re isar isko faccident.
The refore ,onlyu setire typesand sizes
ap pro ved foryour veh iclem odel.O bserve the
tire load rating andspee dr ating
req uired foryour veh icle. 0043
Tire width
0044 Nom inalasp ec tratio in%
0087 Tire cod e
0085 Rimd iame ter
0083 Loadbearing index
0084 Spe edrating
Ge neral: dependi ng on the manuf actu rer's
sta nda rds,the size imp rinted inthe tire wall
ma ynotconta inany letters orma yconta in
one letter thatpreced esthe size descri ption.
If the reisno letter preced ingthe size descri p-
tio n(as sho wnabove ):the searep asse nge r
veh iclet iresa ccord ing toEur opeanm anufac-
tur ing standa rds.
If "P "p reced esthe size descri ption: theseare
pa sse nge rvehiclet iresa ccord ing toU.S. man-
uf actu rings tanda rds.
If "L T" pre ced esthe size descri ption: theseare
li ght truck tire saccord ing toU.S. manuf actu r-
ing standa rds.
If "T "p reced esthe size descri ption: comp act
eme rgency wheelswith high tire pressu retha t
ar eo nlyd esigne df or temp oraryusei na n
eme rgency .
Tire width: tirewidth 0043sho wsthe nomi nal
tire width inmil limete rs.
He ight-w idth ratio :as pe ct ratio 0044 isthe size
ra tio betwe enthe tire height and tirewidth
and issho wninpe rcen t.The aspe ct ratio is
cal cul ate dbydivid ing the tire width bythe tire
he ight.
Tire code: tire code0087 speci fiest he tire type.
"R "r ep res ents radial tire s;"D" represents
di ag ona ltire s;"B" represents diag ona lrad ial
tire s. 28
4 Al
la bo ut whee lsan dt iresWhe elsa nd tire s

Optionally
,tires with amaximum speedofover
149 mph (240km/h )mayhave "ZR"int he
size description, dependingonthe manufac-
turer (e.g.245/4 0ZR1 8).
Rim diameter: rimdiameter 0085isthe diame-
ter ofthe bead seat,notthediameter ofthe
rim flange. Therimdiameter isspecified in
inches (in).
Load-bearing index:load-bea ringindex 0083is
an umerical codethatspecifies themaximum
load-bea ringcapacity ofat ire.
Do not overload thetires byexceeding the
specified loadlimit. Themaximum permissible
load canbefound onthe vehicle's Tireand
Loading Information placardonthe B-pillar on
the driver's side(Ypage 280).
Example:
Load-bearing index91indicates amaximum
load of1,356 lb(61 5kg)that thetires can
bear. Forfurther information onthe maximum
tire load inkilograms andlbs,see
(Y page 286).
For further information onthe load bearing
index, see"Load index" (Ypage 286).
Speed rating: speedrating0084specifies the
approved maximum speedofthe tire.
i Tire
data isvehicle-specific andmay devi-
ate from thedata inthe example.
Rega rdless ofthe speed rating, alwaysobserve
the speed limits. Drivecarefully andadap t
your driving styletothe traffic conditions. Summer
tires Index Speed
rating Q up
to100 mph (160 km/h) R up
to106 mph (170 km/h) S up
to112 mph (180 km/h) T up
to118 mph (190 km/h) H up
to130 mph (210 km/h) V up
to149 mph (240 km/h) W up
to168 mph (270 km/h) Y up
to186 mph (300 km/h) ZR...Y up
to186 mph (300 km/h) Summer
tires Index Speed
rating ZR...(..Y) over
186mph (300km/h ) ZR over
149mph (240km/h ) R
Optionally ,tires with amaximum speedof
over 149mph (240 km/h) mayhave "ZR"in
the size description, dependingonthe man-
ufacturer (e.g.245/4 0ZR18 ).
The service specification ismade upofload-
bearing index0083and speed rating0084.
R Ifthe size description ofyour tireincludes
"ZR "and there arenoservice specifications,
ask thetire manufacturer inorder tofind
out themaximum speed.
If as ervice specification isavail able, the
maximum speedislimited according tothe
speed ratinginthe service specification.
Example: 245/40ZR18 97Y.Inthis exam-
ple, "97Y"isthe service specifica tion.The
letter "Y"represents thespeed rating. The
maximum speedofthe tire islimi ted to
186 mph (300 km/h).
R The size descriptio nfor all tires withmaxi-
mum speed sofover 186 mph (300 km/h)
must include "ZR",and theservice specifi-
cation mustbegiven inparentheses .Exam-
ple: 275/40 ZR18 (99 Y).S peed rating "(Y)"
indicates thatthemaximum speedofthe
tire isover 186mph (300 km/h). Askthe
tire manufacture rabou tthe maximum
speed . All
-
weather
tires
and win-
ter tires Index Speed
rating QM
+S1 up
to100 mph (160 km/h) TM
+S1 up
to118 mph (190 km/h) HM
+S1 up
to130 mph (210 km/h) VM
+S1 up
to149 mph (240 km/h) 1
Or M+S 004D forwinter tires. Al
la bout wheelsand tires
285Wheelsand tires Z

i
Not
alltires withtheM+S marking provide
the driving characteristics ofwinter tires.In
addi tion tothe M+S marking, wintertires
also have the004D snowflake symbolonthe
tire wall.Tires withthismarking fulfillthe
requi rements ofthe Rub ber Manufa cturers
Association (RMA)andtheRub ber Associa-
tion ofCana da(RAC) regardi ngthe tire trac-
tion onsnow. Theyhave been especia lly
develo pedfordriving onsnow.
An electronic speedlimiter prevents yourvehi-
cle from exceeding aspeed of130 mph
(210 km/h).
The speed ratingoftires mounted atthe fac-
tory may behigher thanthemaximum speed
that theelectronic speedlimiter permits.
Make surethatyourtires have therequi red
speed rating, e.g.when buying new tires. The
requi redspeed ratingforyou rvehicle canbe
found inthe "tires" section (Ypage 293).
Further information aboutreadi ngtire data
can beobtained fromanyqualifiedspecia list
workshop.
Load index In
addi tion tothe load -bearing index,load
index 0043may alsobeimprinted onthe side-
wal lofthe tire. Youwillfind this after thelet-
ter that identifies thespeed rating
(Y page 284).
R Ifno specifica tionisgiven: notext (asinthe
example above),represents astandard load
(SL) tire
R XL orExt raLoad: represents areinforced
tire
R Light Load: represents alight load tire
R C, D, E:represents aload range that
depends onthe maximum loadthatthetire
can carry atac ertain pressure i
Tire
data isvehicle-spe cificandmay devi-
ate from thedata inthe example .
Maximum loadrating Maximum
tireload 0043isthe maximum permis-
sible weightfor which thetire isapprove d.
Do not overloa dthe tires byexceeding the
specifie dload limit. Themaximum permissible
load canbefound onthe vehicle's Tireand
Loadi ngInformation placardon the B-pilla ron
the driver's side(Ypage 280).
i The
actual valuesfor tires arevehicle-spe -
cific andmay devia tefrom thevalu esinthe
illu stration.
DOT, TireIdentifi cationNumber (TIN) US
tire regul ations stipulatethat every tire
manufacturer orretreader mustimprint aTIN
in or on the sidew allofeach tireproduced . The
TINisau niqu eidentification number.The
TIN enable sthe tire manufacturers orretread-
ers toinform purchase rsof recalls andother
safety-rele vantmatters. Itmakes itpossib le
for the purchase rtoe asilyidentify theaffected
tires. 286
All
about wheelsand tiresWheel sand tires

The
TINismade upofmanufact ureridentific a-
tion code 0044,tiresize 0087,t iretype code 0085
and manufact uringdate0083.
DOT (Departm entofTra nsport ation): tire
symbol 0043marks thatthetire complies with
the requirement softhe U.S. Departm entof
Transport ation.
Manufa ctureridentification code:manufac-
turer identific ationcode0044provides detailson
the tire manufact urer.Newtireshave acode
with twosymbols. Retreaded tireshave acode
with foursymbols.
For further informationabout retreaded tires,
see (Ypage 293).
Tire size: identifier 0087describes thetire size.
Tire typecode: tiretype code 0085can beused
by the manufact urerasac ode todescribe
specific characteristics ofthe tire.
Date ofmanu factur e:date ofmanufact ure
0083 provides informationabout theage ofa
tire. Thefirst andsecond positions represent
the week ofmanufact ure,start ingwith "01"
for the first calendar week.Positions threeand
four represent theyear ofmanufact ure.For
example, atire that ismarked "3214"was
manufact uredinweek 32in2014 .
i Tire
data isvehicle-spec ificand may devi-
ate from thedata inthe example.
Tire chara cteristics This
inform ationdescribes thetype oftire cord
and thenumber oflayers insidewall 0043and
under tiretread 0044.
i Tire
data isvehicle-spec ificand may devi-
ate from thedata inthe example. Definition
ofterm sfor tires andload-
ing Tire
plycomposition andmaterial used
Descr ibesthenumber ofplies orthe number
of layers ofrubber-coat edfabric inthe tire
tread andsidewall .These aremade ofsteel,
nylon, polyester andother materials.
Bar
Metric unitfortire pressure. 14.5038pounds
per square inch(psi) and100 kilopascals (kPa)
are the equivalent of1b ar.
DOT (Departm entofTransport ation)
DOT- marked tiresfulfill therequirement sof
the USD epartm entofTransport ation.
Norm aloccupant weight
The number ofoccupant sfor which thevehicle
is designed multiplied by68 kilograms
(150 lbs).
Uniform TireQuality Grading Stand ards
Au niform standard tograde thequality oftires
with regards totread quality, tiretract ionand
temperat urecharact eristics. Thequality grad-
ing assessment ismade bythe manufact urer
following specification sfrom theU.S. govern-
ment .The ratings aremolded intothesidewall
of the tire.
Recommended tirepressur es
The recomm endedtirepressure appliestothe
tires mounted atthe factor y.
The Tire andLoading Information placard con-
tains therecomm endedtirepressures forcold
tires onafully loaded vehicle andforthe maxi-
mum permissible vehiclespeed.
The tirepressure tablecontains therecom-
mended pressures forcold tires forvarious
operating conditions,i.e.differing loadand
speed conditions.
Increased vehicleweightduetooptional
equipm ent
The combined weightofall standard and
optional equipment availablefor the vehicle,
regardless ofwhether itis actually installed on
the vehicle ornot . All
about wheelsand tires
287Wheels andtires Z

Rim
Thi sist he partof the whe elon whi chthe tire
is mou nted.
GAW R(Gro ssAxleWei ght Ratin g)
The GAW Risthe maxi mum grossaxlew eigh t
rati ng. The actu alloa do nana xlem ustn eve r
excee dthe gros saxlew eigh trati ng. The gros s
axl ew eigh trati ng can befou ndonthe vehi cle
id entif ication plate onthe B-pi llar on the driv-
er's side.
Spe edrating
The speedrati ngispa rtof the tire identif ica-
tion. Itspe cifiesthe speedrang efor whi chthe
tire isap pro ved .
GVW (GrossVehi cleW eight)
The gros svehi cle weigh tincl udes the weigh t
of the vehi cleincluding fuel,tool s,the spare
whe el,a cce ssoriesinsta lled, occu pants, lug-
ga ge and thedrawbarnose weigh t,ifap plica -
bl e. The gros svehi cle weigh tm ustn ot excee d
the gros svehi cle weigh trati ng GVW Rasspeci-
fie do nthe vehi cleidentif ication plate onthe
B-pi llar on the driver' sside.
GVWR (GrossVehi cleW eight Ratin g)
The GVW Risthe maxi mum permis siblegros s
we igh tofa fullyloa ded vehicle(the weigh tof
the vehi cleincluding alla cce ssories,occu -
pa nts, fuel,lu gga geand thedrawbarnose -
we igh t,ifap plica ble). The gros svehi cle weigh t
rati ngisspe cified on the vehi cleidentif ication
pl ate onthe B-pi llar on the driver' sside.
Maxi mum loaded vehicle we ight
The maxi mum weigh tist he sumo f:
R the curb weigh tofthe vehi cle
R the weigh tofthe acce ssories
R the loadlim it
R the weigh tofthe facto ryinsta lled opti onal
equ ipment
Ki lopasc al(kP a)
Metri cunitf or tire pressu re.6.9 kPa corre -
spo nds to1p si.A nother unitfor tire pressu re
is ba r.100 kilopa scals(kPa )are the equivalent
of 1b ar. Lo
ad index
In addition tothe load-be aring index, the load
ind exmay also be imp rinte donthe sidewallo f
the tire.Thiss pecifi esthe load-be aring cap a-
city more precise ly.
Curb weight
The weigh tofa vehi clewith stand ardequip-
ment including the maxi mum capacityof fue l,
oil and coolant. Italso incl udes the air-condi -
tioni ngsystem andoptionalequ ipment ifthes e
are insta lled inthe vehi cle,but doe snot
incl udep asse ngers orlugga ge.
Maxi mum load rating
The maxi mum loadrating isthe maxi mum per-
mis siblewe igh tink ilogra msorlbsf or whi cha
tire isap pro ved .
Maxi mum permis sibl et ire press ure
Ma ximu mpermis sibletire pressu refor one
tire .
Maxi mum load on onet ire
Ma ximu mloado nonetire .Thisi sc alcul ate d
by divid ing the maxi mum axleloa do fone axle
by two.
PSI (pounds persquare inch)
As tand ardunitofm easure for tire pressu re.
As pec tratio
Re lations hipbetw eentireheight and tirewidth
in per cent.
Tire press ure
Thi sisp ressu reinsi dethe tire applying anout-
wa rdforce toeach squ are inch ofthe tire's
su rfa ce. The tirepressu reisspe cified in
pou nds persquare inch (psi) ,ink ilopa scal
(kPa )orinb ar.T he tire pressu resho uldo nly
be corre ctedwhenthe tire sarecold .
Co ldtire press ure
The tiresarecold :
R ifthe vehi clehasb eenp arked with the tires
ou to fdirect sunli ght foratleas tthree hours
and
R ifthe vehi clehasn otbee ndriven further
than 1mile( 1.6 km) 288
Al
la bo ut wh eelsand tiresWhee lsand tires